How do you change brake light on a citroen c4 Picasso?

To change the brake light on a Citroën C4 Picasso, first, open the rear hatch and remove the plastic cover or panel that protects the tail light assembly. Next, twist the bulb holder counterclockwise to release it from the assembly and pull it out gently. Replace the old bulb with a new one, ensuring it is securely fitted, then reinsert the bulb holder into the assembly and twist it clockwise to lock it in place. Finally, replace the cover or panel and test the brake light to ensure it works.